... large coil of sheet metal, between 1 in. and 20in. in width, and 0.004 in. and 0.125 in. thick, ... rolls may also be used to provide greater precision and flexibility and to limit stresses on the material. 5. ... cut to length ahead of a roll forming mill, between mills, or at the end of the roll ... being rolled (ft), d is the distance between forming stands (ft), and n is the number of forming stands. ...